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First, we need to put the data in ascending order:
{8, 10, 11, 11, 11.4, 12.3, 12.5, 12.5, 13, 14, 14, 14.1, 26}
Now we count to find the middle value. Since the data set has 13 values, the middle value will be the (13+1)/2 = 7th value.
So, the median hair length is the 7th value, which is 12.5 inches.